Scared to death and afraid it's going to have an affect on my baby

I'm scared I don't know who the father is..... I slept with someone other than my regular partner in either August or September and per the doctor I conceived in October. At first it was at the end of October so I wasn't scared. I remember having my period on the 24th. But each time I go back to the doctor, she keeps moving my conception date earlier and earlier. I don't know what to do and I think about it everyday. Is there any chance it could not be my regular partner's? Today I am 15wks going on 16 in the next couple of days as per my last doctor visit.

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